Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

Hyădes, um, f., = Ὑάδες (the rainers), the Hyades, a group of seven stars in the head of Taurus (called in pure Lat. suculae; v. 3. sucula), Cic. N. D. 2, 43, 111; Plin. 18, 26, 66, § 247; 37, 7, 28, § 100; cf. id. 2, 39, 39, § 106. They were fabled as daughters of Atlas and sisters of Hyas and of the Pleiades, Ov. F. 5, 165 sq.; id. M. 3, 595; 13, 293; Verg. A. 3, 516; Hor. C. 1, 3, 14.
In sing.: Hyas, ădis, the Hyad, collect., Stat. S. 1, 6, 22.

1. Hyas, antis (acc. Hyān, Ov. F. 5, 179), m., = Ὕας, a son of Atlas, and father or brother of the Hyades, Hyg. Fab. 192; Ov. F. 5, 170.
Hence, Sidus Hyantis, the Hyades, id. ib. 5, 734.

2. Hyas, ădis, f., v. Hyades.